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Glyn ParsonDan that may have been how things once were but I can assure you we use regular 100 watt light bulbs in an otherwise completely dark room. Kevin is correct that this is the best environment for detecting alterations as well as minor surface creases or wrinkles. The lack of outside light cuts down on the glare that sometimes hides these imperfections. The glare, hiding wrinkles etc. is often the source of the problems when people think they have an 8 and get a 4.